Saw-mill dog



(No Model.) A J. AGKERMAN,,A. O. MITCHELL & F. M. UNDERWOOD. SAW MILL DOG.

No. 274,099.. Patented Mar. 20,1883.

UNITED STATES PATENT FFICE.

JOHN AOKERMAN, AOKBER O. MITCHELL, AND FRANK M. UNDERWOOD, OF

COLUMBUS, OH[O. I

SAW-MILL DOG.

SPECIFICATION forming part of Letters Patent No. 274,099, dated March 20, 1883.

'Application filed January 20, 1883. (No model.)

To all whom it may concern:

. Be it known that we, JOHN AOKER-MAN, AoK- BER O. MIToHELL, and FRANK M. UNDER- WOOD, citizens of the United States, residing at Columbus, in the county of Franklinand State of Ohio, have invented a certain new and useful Improvenientin Saw-Mill Dogs, of which the following is a specification. Our invention relates to improvements in m saw-mill dogs where both an upper and lower dog are used to hold the log on the head-block; and the objects of our improvements are, first, toprovide, in connection with a vertical rack secured to the side of the standard, adjustable 1 dogs capable of holdinga log of any thickness or its last board; second, to provide a pivoted rack carrying dogs capable of being swung thereon to the rear, and thus out of the way. We attain these objects by the mechanism illustrated in the accompanying drawings, in

which- Figure 1 is a side elevation of a head-block with a dog set to hold a square piece of timber. Fig. 2 is a similar view of a head-block 2 having the rack-bar, with the dogs thereon, swung around out of the way toward the rear of the standard. Fig. 3 shows a portion of the operating-lever, with the cogs thereon, in engagement with the rack-bar. Fig. 4 shows a portion of the rack with the upper dog, its

frame and clamping-bolt, and lever.

Similar letters reler to similar parts th roughout the several views. A represents a standard secured to the head- 5 block B in the usual manner. To the standard Ais attached, by means of two perforated arms or eyebolts, b b, projecting respectively from near the top and bottom of the standard and at right angles to the face thereof, a bar,

0, having rackteeth on its side. This bar 0 terminates at both ends in short cylindrical journals or pivots, which pass through the holes in the arms b b. Adjoining said journals the rack has shoulders 0 produced by cutting 4 5 away. the metal to form said pivots. The shoulders rest against the arms I) b, and by this mode the rack-bar is held in place against the side of the standard A. From the front ofthis barGis made to projectan upper dog,

D, of the usual shape. It is secured to a flat '50 metal plate, 0, so bent or formed as to be adapted to inclose three sides of the bar. The ends of plate 6 extend far enough beyond the teeth on the bar to allow of their connection by threebolts,whichpassinfrontoftherack. The central connectingbolt, f, supports a cogged lever, E, having three cogs thereon adapted to engage with the teeth on the sideoi therack-bar, as shown in Fig.3, by means of which the dog is held at any desired height on the bar. The end of the boltf carries a nut provided with a handle,f, by which it may be tightened sut ficiently to slightly. spring the cheek-pieces formed by the end of the dog-carrying plate 0, and, by forcing the cheek-pieces against the6 hub of the said levers, prevent the accidental release of the cogged lever E. To the lower cylindrical end of the bar 0 a lower dog, F, is firmly secured, said dog being bent outwardly to prevent the head-block from interfering 79 with its movements. By elevating the handle of the lever until near a vertical position the three cogs on the lever are made to clear the rack and allow the upper dog, D, with the bearing-plates e, to ascend or descend at the i will of the operator. When the upper dog, D, strikes the log or block of wood the handle of the lever is pressed down until its free end assumes a position below its pivot, which causes the cogs on the lever to re engage with the 80 rack and raise it until its top shoulder meets the upper arm, b, i the same movement that is made to lowerthe upper dog, D, raising the lower dog, F, until their sharp points sink into the wood and hold itfast. When it is desired 8 to place a new log on the head-block the rackbar having the dogs thereon is swung to the rear, as shown in Fig. 2, the small cylindrical ends of the bar being free to rotate in the bearings in the arms b of the standard.

Having now fully described our invention, what we claim, and desire to secure by Letters Patent, is

1. The combination of a saw-mill standard andjournal-bearing arms b, projecting from the 5 top and bottom thereof, with a rack-bar having cylindrical journals at each, end, a deg, F, at its lower end, and a movable dog adapted to be secured upon said rack, substantially as from the front of the head-piece, substantially and for the purpose described. as and for the purpose described.

t 2. The combination of a saw-mill standard, JOHN AOKERMAN.

A, and journal-bearing arms 12, projectingfrom AOKBER O. M ITOHELL.

the side thereof, with a rack-bar having cylin- FRANK M. UNDERWOOD.

drical journals at each end, a lower dog, F, se- Witnesses:

cured thereon, andadjustable dog D, adapted U. C. SHEPHERD,

to have its hooked point turned with the rack J. H. BAYEs. 

